Senior JavaScript Engineer (Web3)

TL;DR

Senior JavaScript Engineer (Web3): Building rich frontend experiences, scalable backend services, and developer tooling for secure digital-asset wallet infrastructure with an accent on full-stack development, API design, fintech, and blockchain systems. Focus on designing secure-by-default architecture, scaling wallet and payments infrastructure, and improving reliability, performance, and developer experience.

Location: Romania; fully remote or from the Bucharest office

Company

hirify.global is a custom product engineering company supporting multinational organizations and scaling startups with software engineering, consulting, analytics, and product development.

What you will do

• Design and implement frontend experiences and scalable backend services for digital-asset wallet infrastructure.
• Own full-stack features from technical design and architecture through implementation, testing, deployment, and optimization.
• Build and maintain Node.js services and APIs for authentication, wallets, and payments.
• Develop user-facing applications and developer tooling for end users and engineering teams.
• Collaborate with Product, Design, and Engineering teams to deliver reliable, high-impact features.
• Improve platform performance, security, reliability, scalability, documentation, and engineering practices.

Requirements

• 3–5 years of experience building and shipping production-grade full-stack web applications.
• Experience building backend systems and APIs with Node.js and frameworks such as Express.
• Ability to work across frontend and backend systems in complex, evolving codebases.
• Strong focus on clean, maintainable code and system performance.
• Experience collaborating with product and design partners.
• Interest in fintech, Web3, and infrastructure operating at global scale.

Nice to have

• Experience with blockchain technologies, EVM chains, wallets, or on-chain integrations.
• Production experience writing, deploying, testing, or integrating Solidity smart contracts.
• Experience maintaining and securing smart contract systems after deployment.
• Experience with state management solutions in React applications.
• Experience with security products or other high-sensitivity domains.

Culture & Benefits

• Open and collaborative community of experienced professionals.
• Large-scale projects with global impact and opportunities for internal mobility.
• Learning support through meetups, conferences, workshops, Udemy, language courses, and company-paid certifications.
• Choice of remote work or working from the office.
• Medical subscription through Regina Maria and meal tickets of 16 RON net per worked day.

Hiring process

• Submit an application to begin the recruitment process.